Schaub is coming off his second-lowest passer rating of a disappointing season which has seen him benched twice in favor of Keenum. Yates has been relegated to mop-up duty since tossing three interceptions in a playoff loss to the Ravens two seasons ago.

Here's what else we learned from Phillips' news conference:

» Jonathan Grimes is the only healthy running back on the Texans' roster. Arian Foster and Ben Tate have already been placed on injured reserve. Fill-in starter Dennis Johnson was forced from Sunday's game with a bruised hip, and backup Deji Karim suffered a broken collarbone.

» Cornerback Johnathan Joseph will undergo surgery to repair a torn toe ligament suffered in Sunday's game. The Texans will have a decision to make on his $7.5 million salary for 2014.

UPDATE: Phillips was asked Tuesday on whether or not Yates would be an option to start Sunday. "Not right now," the interim coach said, via the team's official website.